Old footage has surfaced that reveals how incredible of an athlete the 7'1" Wilt Chamberlain was. Despite weighing 240-250lbs his sophomore year in college, he is vaulting his way to nearly the top of a regulation backboard and the footage of this event was captured during a one-step block attempt in an actual GAME.

His standing reach in the pro's was known to be 114" (9'6"). The top of the backboard is 156" (13'). Even if we assume he is fully grown at this time (which he may not be), this would still peg his necessary flat-foot (with one step) vertical to accomplish the block between 40 and 42"

This follows close suit with the elevation necessary to accomplish a 3-step off one leg High Jump PR of 6'6.75". He did this with relatively unrefined form, in an era before the fosbury flop. His pelvis mid-point is just under 4', and in order to clear the bar with his basic jump-style he needed to raise said mid-point to a minimum of 40.35".